Amazon.com: Professional Soil pH Meter Tester,3~8 pH High Accuracy Soil pH and Moisture Meter Hygrometer, Soil Tester Monitor for Vineyards, Orchards, Field Production, Lawn, Gardens : Patio, Lawn & Garden
Basic pH Meter – Sper Scientific Direct
Field Ph Meter at Thomas Scientific
FieldScout pH 110 Meter | Spectrum Technologies
Mettler Toledo FiveGo F2 pH/mV Meters F2 Field kit:pH and Electrochemistry, | Fisher Scientific